Rotary to linear transmission

An apparatus for converting rotary motion to linear motion comprising:

• a cylindrical bore;
• a plurality of balls of uniform radius;
• a rotor element comprising a helical groove on a perimeter of the rotor element, wherein the helical groove comprises two ends and a race, wherein the race is configured to hold the plurality of balls in contact with a surface of the bore and is further configured to roll the ball in a helical groove path, and further wherein the rotor element comprises two half sections;
• and
• a recirculation conduit joining the two ends of the helical groove, wherein the conduit is configured to create a conduit path for the plurality of balls and is further configured to allow the plurality of balls to remain in the helical groove during rotation of the rotor element.

An apparatus for converting rotary motion to linear motion comprising:

• a cylindrical bore;
• a plurality of balls of uniform radius;
• a rotor element comprising a helical groove on a perimeter of the rotor element, wherein the helical groove comprises two ends and a race, wherein the race is configured to hold the plurality of balls in contact with a surface of the bore and is further configured to roll the ball in a helical groove path;
• a ball spacing ring coupled to the rotor element;
• and
• a recirculation conduit joining the two ends of the helical groove, wherein the conduit is configured to create a conduit path for the plurality of balls and is further configured to allow the plurality of balls to remain in the helical groove during rotation of the rotor element.